/Engine/Plugins/Runtime/CommonUI/Source/CommonUI/Public/CommonLoadGuard.h
Use GuardAndLoadAsset to automatically display the loading state until the asset is loaded (then the content widget will be displayed). For other applications (ex: waiting for an async backend call to complete), you can manually set the loading state of the guard.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(Config=Game, defaultconfig) class UCommonLoadGuard : public [UContentWidget](API\Runtime\UMG\Components\UContentWidget)
bool
bShowLoading